Tube retainer



FIG. 1 is a perspective view illustrating a tube retainer for arespiratory mask according to our design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view thereof showing the tube retainer in use.

The broken lines showing the books and loops of the tube retainer,environment or structure are for illustrative purposes only and form nopart of the claimed design.

The ornamental design of a tube retainer, as shown and described.